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(No Mdel.)

J. T. ROBB. EXTENSION BLBGTROLIER. No. 435,368. Patented Aug. 26, 1890.

a im C d a JAMES T. ROBB, OF

MOUNT VERNON, AssieNoR To PATENT OEEICE.

THE EDISON GENERAL ELECTRIC COMPANY, OF NEV YORK, N. Y.

EXTENSION-ELECTROLIER.

SPECIFICATION forming part of Letters Patent No. 435,368, dated August 2e, 1890.

Application fled September 21, 1889. Serial No. 324,658. (No model.)

To all whom it may concern:

Be it known that I, JAMES T. ROBE, a subvJect of the Queen of Great Britain, residing at Mount Vernon, in the county of Westchester and State of New York, have invented a new and useful Improvement in Extension- Electroliers, of which t-he following is a speciflcation.

The object of this invention is to apply to any desirable form of extensible fixture the electric-current conductors in such manner that the extensible character of the xture will not be impaired and so that sliding electrical contacts will be avoided.

In accomplishing this object I employ flexible conductors thrown into a fold between a fixed and movable part of the fixture, with a' tension device applied at the fold to preserve the conductors taut.

In the accompanying drawings, forming a part of this specification, Figure 1 is an elevation of a lixture embodying my invention 1n its preferred form; and Fig. 2 is a similar elevation of a fixture dierently arranged, also embodying my invention.

A is the fixed stem of the fixture, and B the sliding stem thereof. The sliding stem carries the lamps C and shade D, the weight of which may be balanced in any of the wellknown methods-aa for instance, by the chains E E', passing over rollers F F', mounted on the fixed stem A and carrying the counterbalance-weights G C. I

The conductors a a are of insulated flexible wire and are carried down through the stem A and out at the branches b b', and are then thrown into a fold or loop, preferably by carrying them down a certain distance parallel to stem'A, and then in the reverse direction and over the guide-rollers c c', and thence again parallel to the fixture-stems to the lampterminals. Between the guide-rollers c c and the point where the conductors leave the fixture a tension device, as a traveler-roller cl d', is applied fto the conductors to preserve them taut in whatever vertical position the lamps may be.

The operation is readily perceived. As the electrolier is extended the looped portion of the conductors is drawn over the guide-pulture, of a leys, thereby shortening it and carrying the rollers d d higher, but not otherwise disturbing the system. As the electrolier is shortened the weight of the rollers d d draws the conductors back again over the guide-rollers as rapidly as the electrolier is shortened, thus maintaining the conductors always taut.

The conductors may be arranged at right angles to the counterbalancing system of Fig. l to obtain a graceful effect; or the conductors themselves may be used as a part of the counterbalancing system, as shown in Fig. 2. It will be seen that by this arrangement the objections due to sliding contacts are overcome. It will also be seen that the invention can readily be applied to extensible fixtures of any kind at small expense and will present a sightly and graceful appearance.

What I claim is- 1. The combination, in an extensible fixture, of a stationary member and a rigid movable member, two conductors leading to the light or other device on the movable part and both being folded and weighted, substantially as described.

2. The combination, in an extensible fixture, of a fixed member, a rigid movable member supporting the lights, and two conductors folded and weighted, substantially as described.

3. The combination, in an extensible fixture, of a stationary member, a rigid movable member supporting the lights, said movable member being counterbalanced, flexible conductors, one or more, each thrown into a fold between the fixed and movable parts, and tension devices for holding said conductors taut, substantially as described.

4. r he combination, in an extensible fixture, of a stationary member, a counterbalanced rigid movable member, and conductors passing partially through the stationary member and through branches b b thereof, said conductors being-folded and weight-ed, substantially as described.

5. The combination, in an electric-light tixstationary member, a rigid movable member supporting the lights, and conductors passing down to the end of branch pipes and being folded and weighted, 'substantially as described.

IOO

6. The combination, in an extensible fixture, of a fixed stem, a stem movable therein carrylng an electric-light or other electricallyoperative device, and conductors leading from 5 .said lights parallel with said stem and havlug guide-pulleys and tension devices, substantially as described.

7. The combination, in an extensible electro- 11e1', of the fixed and sliding stems, the lamp xo or lamps carried by said sliding stem, and a counterbalancing system comprising the electrical conductors and balance-\veigl1ts, substantially as set forth.

This speciction signed and witnessed this 12th day of September, 1889.

JAMES T. ROBB. Witnesses:

D. I-I. DRIsooLL, WILLIAM PELZER. 

